CAS IR GRID研究单元&专题: 西安光学精密机械研究所
中国科学院西安光学精密机械研究所( Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences),简称:西安光机所,创建于1962年,是中国科学院在西北地区最大的研究所之一。西安光机所主要研究领域包括基础光学、空间光学、光电工程,主要研究方向包括瞬态光学与光子学理论与技术、空间光学遥感技术、干涉光谱成像理论与技术、光电信息技术。
http://www.irgrid.ac.cn:8080/handle/1471x/21930
2024-03-28T22:23:27Z
2024-03-28T22:23:27Z
Entanglement Generation of Polar Molecules via Deep Reinforcement Learning
Zhang, Zuo-Yuan
Sun, Zhaoxi
Duan, Tao
Ding, Yi-Kai
Huang, Xinning
Liu, Jin-Ming
http://www.irgrid.ac.cn:8080/handle/1471x/7275976
2024-03-26T16:09:09Z
2024-03-26T16:09:09Z
题名: Entanglement Generation of Polar Molecules via Deep Reinforcement Learning
作者: Zhang, Zuo-Yuan; Sun, Zhaoxi; Duan, Tao; Ding, Yi-Kai; Huang, Xinning; Liu, Jin-Ming
摘要: Polar molecules are a promising platform for achieving scalable quantum information processing because of their long-range electric dipole-dipole interactions. Here, we take the coupled ultracold CaF molecules in an external electric field with gradient as qubits and concentrate on the creation of intermolecular entanglement with the method of deep reinforcement learning (RL). After sufficient training episodes, the educated RL agents can discover optimal time-dependent control fields that steer the molecular systems from separate states to two-qubit and three-qubit entangled states with high fidelities. We analyze the fidelities and the negativities (characterizing entanglement) of the generated states as a function of training episodes. Moreover, we present the population dynamics of the molecular systems under the influence of control fields discovered by the agents. Compared with the schemes for creating molecular entangled states based on optimal control theory, some conditions (e.g., molecular spacing and electric field gradient) adopted in this work are more feasible in the experiment. Our results demonstrate the potential of machine learning to effectively solve quantum control problems in polar molecular systems.
2024-03-26T16:09:09Z
Sanxingdui Cultural Relics Recognition Algorithm Based on Hyperspectral Multi-Network Fusion
Qiu, Shi
Zhang, Pengchang
Tang, Xingjia
Zeng, Zimu
Zhang, Miao
Hu, Bingliang
http://www.irgrid.ac.cn:8080/handle/1471x/7275983
2024-03-26T16:09:09Z
2024-03-26T02:51:20Z
题名: Sanxingdui Cultural Relics Recognition Algorithm Based on Hyperspectral Multi-Network Fusion
作者: Qiu, Shi; Zhang, Pengchang; Tang, Xingjia; Zeng, Zimu; Zhang, Miao; Hu, Bingliang
摘要: <p>Sanxingdui cultural relics are the precious cultural heritage of humanity with high values of history, science, culture, art and research. However, mainstream analytical methods are contacting and detrimental, which is unfavorable to the protection of cultural relics. This paper improves the accuracy of the extraction, location, and analysis of artifacts using hyperspectral methods. To improve the accuracy of cultural relic mining, positioning, and analysis, the segmentation algorithm of Sanxingdui cultural relics based on the spatial spectrum integrated network is proposed with the support of hyperspectral techniques. Firstly, region stitching algorithm based on the relative position of hyper spectrally collected data is proposed to improve stitching efficiency. Secondly, given the prominence of traditional HRNet (High-Resolution Net) models in high-resolution data processing, the spatial attention mechanism is put forward to obtain spatial dimension information. Thirdly, in view of the prominence of 3D networks in spectral information acquisition, the pyramid 3D residual network model is proposed to obtain internal spectral dimensional information. Fourthly, four kinds of fusion methods at the level of data and decision are presented to achieve cultural relic labeling. As shown by the experiment results, the proposed network adopts an integrated method of data-level and decision-level, which achieves the optimal average accuracy of identification 0.84, realizes shallow coverage of cultural relics labeling, and effectively supports the mining and protection of cultural relics.</p>
2024-03-26T02:51:20Z
Reconstruction of structured illumination microscopy with an untrained neural network
Liu, Xin
Li, Jinze
Fang, Xiang
Li, Jiaoyue
Zheng, Juanjuan
Li, Jianlang
Ali, Nauman
Zuo, Chao
Gao, Peng
An, Sha
http://www.irgrid.ac.cn:8080/handle/1471x/7275979
2024-03-26T16:09:09Z
2024-03-26T02:51:18Z
题名: Reconstruction of structured illumination microscopy with an untrained neural network
作者: Liu, Xin; Li, Jinze; Fang, Xiang; Li, Jiaoyue; Zheng, Juanjuan; Li, Jianlang; Ali, Nauman; Zuo, Chao; Gao, Peng; An, Sha
摘要: <p>Structured illumination microscopy (SIM) is one of super-resolution optical microscopic techniques, and it has been widely used in biological research. In this paper, a physics-driven deep image prior framework for super-resolution reconstruction of SIM (entitled DIP-SIM) is proposed. DIP-SIM does not rely on a large number of labeled data, and the output becomes more interpretable due to the intrinsic constraint of a physical model. Both the simulation and experiment verify that DIP-SIM can reconstruct a super-resolution image with a quality comparable to conventional SIM. Of note, it allows for super-resolution reconstruction from three raw images for two-orientation SIM and four raw images for three-orientation SIM, and hence it has a much faster imaging speed and lower photobleaching compared with the traditional SIM. We can envisage that the proposed method can be applied to chemistry and biomedical fields, etc.</p>
2024-03-26T02:51:18Z
Coincidence time resolution measurements for dual-ended readout PET detectors
Sun, M. D.
Zhang, C. H.
Zhao, B. Q.
http://www.irgrid.ac.cn:8080/handle/1471x/7275984
2024-03-26T16:09:09Z
2024-03-26T02:51:16Z
题名: Coincidence time resolution measurements for dual-ended readout PET detectors
作者: Sun, M. D.; Zhang, C. H.; Zhao, B. Q.
摘要: Coincidence time resolution (CTR) is an important performance parameter of clinical positron emission tomography (PET) detectors, which is dependent on the parameters of the scintillation crystal, the timing measurement methods, and the electronics. In this work, CTRs of PET detectors using dual-ended readout of segmented LYSO arrays were measured with different timing measurement methods. The detector modules were composed of LYSO arrays of 8 x 8 with a crystal size of 3.10 x 3.10 x 20 mm3 or 13 x 13 with a crystals size of 1.88 x 1.88 x 20 mm3 , coupled at each end to an 8 x 8 Hamamatsu SiPM array (S13361-3050NE-08) with pixel active area of 3.00 x 3.00 mm2 and pitch of 3.20 mm. The signals of the SiPM arrays were individually read out and processed by using the TOFPET2 ASICs. The CTRs of the detectors were measured after the timing alignment of the ASICs was performed. Timing measurement methods of the dual-ended readout detector such as the average time of the two SiPMs, the faster time of the two SiPMs, the time of the back SiPM, and the time of the front SiPM were compared. The average time of the two SiPMs provides the best CTR, which is explained by a simple model about the timing measurement methods of a dual-ended readout detector. The detector with one-to-one crystal-to-SiPM coupling provides better CTR than the detector with a crystal size smaller than the pixel size of the SiPM. The best CTR of 367 +/- 6 ps was obtained by using the 8 x 8 LYSO array with unpolished lateral crystal surfaces and ESR reflectors. The CTR of the dual-ended readout detector can be improved if a DOI-dependent timing correction is used.
2024-03-26T02:51:16Z
A reversible data hiding method based on bitmap prediction for AMBTC compressed hyperspectral images
Zhang, Xiaoran
Pan, Zhibin
Zhou, Quan
Fan, Guojun
Dong, Jing
http://www.irgrid.ac.cn:8080/handle/1471x/7275978
2024-03-26T16:09:09Z
2024-03-26T02:51:15Z
题名: A reversible data hiding method based on bitmap prediction for AMBTC compressed hyperspectral images
作者: Zhang, Xiaoran; Pan, Zhibin; Zhou, Quan; Fan, Guojun; Dong, Jing
摘要: In the transmission of hyperspectral images that have been compressed using absolute moment block truncation coding (AMBTC), confidentiality and security of crucial information is often a concern. Although many data hiding (DH) methods based on AMBTC work well in guaranteeing a large amount of secret information can be embedded, the requirements of actual user scenarios, such as reversibility and imperceptibility, are degraded sometimes. To address these challenges, we propose an embedding pattern that utilizes bitmap prediction to embed secret information within the bitmaps while preserving the standard format of AMBTC codes and enabling recovery of the cover image without loss. Our proposed method, therefore, belongs to the category of reversible data hiding (RDH) techniques. Since the embedding distortion (ED) reduction is an essential object, an adaptive embedding order based on the features of AMBTC codes is conducted. Furthermore, we propose a dynamical embedding scheme to reduce ED when we are striving to achieve a larger embedding capacity (EC).
2024-03-26T02:51:15Z
Study on the construction of twisted cosine partially coherent beams and their propagation characteristics
Zhang, Shaohua
Zhou, Yuan
Chai, Yutong
Qu, Jun
http://www.irgrid.ac.cn:8080/handle/1471x/7275977
2024-03-26T16:09:09Z
2024-03-26T02:51:13Z
题名: Study on the construction of twisted cosine partially coherent beams and their propagation characteristics
作者: Zhang, Shaohua; Zhou, Yuan; Chai, Yutong; Qu, Jun
摘要: We propose a novel Schell model source for generating twisted partially coherent beams with an initial radius of curvature, which is called a twisted flat-topped cosine Gaussian Schell-model (TFCGSM) source. The TFCGSM beam comprises a wavefront phase and a flat-top structure, with the source degree of coherence determined by two cosine functions. Based on the Huygens-Fresnel principle, the general analytical expression of the cross-spectral density function of the TFCGSM beam propagating through the paraxial ABCD optical system is derived, and then its propagation properties are studied. The results show that the conversion of the array of the beam and the non-uniform structure can be realized by adjusting the parameters in the source plane. As the propagation distance of the TFCGSM beam increases, it rotates around the axis and increases the intensity of the array distribution. Surprisingly, the initial radius of curvature can cause the beam to rotate. The unique shape and properties of the TFCGSM beam create new possibilities for optical communication and enhanced optical functions. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/).
2024-03-26T02:51:13Z
Feasible spindle speed interval identification method for large aeronautical component robotic milling system
Wang, Zhanxi
Zhang, Banghai
Gao, Wei
Qin, Xiansheng
Zhang, Yicha
Zheng, Chen
http://www.irgrid.ac.cn:8080/handle/1471x/7275981
2024-03-26T16:09:09Z
2024-03-22T02:11:06Z
题名: Feasible spindle speed interval identification method for large aeronautical component robotic milling system
作者: Wang, Zhanxi; Zhang, Banghai; Gao, Wei; Qin, Xiansheng; Zhang, Yicha; Zheng, Chen
摘要: <p>Robotic machining systems have been widely implemented in the assembly sites of large components of aircraft, such as wings, aircraft engine rooms, and wing boxes. Milling is the first step in aircraft assembly. It is considered one of the most significant processes because the quality of the subsequent drilling, broaching, and riveting steps depend strongly on the milling accuracy. However, the chatter phenomenon may occur during the milling process because of the low rigidity of the components of the robotic milling system (i.e., robots, shape-preserving holders, and rod parts). This may result in milling failure or even fracture of the robotic milling system. This paper presents a feasible spindle speed interval identification method for large aeronautical component milling systems to eliminate the chatter phenomenon. It is based on the chatter stability model and the analysis results of natural frequency and harmonic response. Firstly, the natural frequencies and harmonics of the main components of the robot milling system are analyzed, and the spindle speed that the milling system needs to avoid is obtained. Then, a flutter stability model considering the instantaneous cutting thickness is established, from which the critical cutting depth corresponding to the spindle speed can be obtained. Finally, the spindle speed interval of the robotic milling system could be optimized based on the results obtained from the chatter stability model and the analysis result of the natural frequency and harmonic response of the milling system. The effectiveness of the proposed spindle speed interval identification method is validated through time-domain simulation and experimental results of the large aeronautical component milling system. © 2024 Elsevier Ltd</p>
2024-03-22T02:11:06Z
可见光脉冲输入下微通道板光电倍增管的动态范围研究
魏佳男
刘虎林
陈萍
李阳
李奎念
韦永林
贺峦轩
赵鑫楠
赛小锋
刘登
田进寿
;赵卫
http://www.irgrid.ac.cn:8080/handle/1471x/7275985
2024-03-26T16:09:09Z
2024-03-21T08:46:31Z
题名: 可见光脉冲输入下微通道板光电倍增管的动态范围研究
作者: 魏佳男; 刘虎林; 陈萍; 李阳; 李奎念; 韦永林; 贺峦轩; 赵鑫楠; 赛小锋; 刘登; 田进寿; ;赵卫
摘要: <p>结合理论分析与实验测试,研究了在可见光脉冲输入条件下频率以及第二片微通道板与阳极之间电势差对微通道板光电倍增管动态范围的影响。研究结果表明:随着信号光脉冲频率的增大,微通道板壁面电荷补充不充分致使阳极输出偏离线性,并逐渐趋于饱和。当输入可见光脉冲宽度为50 ns,频率为500 Hz时,阳极的最大线性输出达到2 V(即40 mA);当输入光频率增加到1 000 Hz,阳极输出在1 V(即20 mA)时线性偏离程度达到10%以上;当输入光频率增加到5 000 Hz,阳极输出在0.3 V(即6 mA)时线性偏离程度达到约15%。随着第二片微通道板与阳极之间电势差的增大,阳极最大线性输出电压呈现波动性变化而非与其呈线性关系。当第二片微通道板与阳极之间的电势差在200 V左右时,阳极线性输出电压达到峰值,随着电势差不断增大,阳极线性输出电压开始出现波动,在电势差为500 V左右时达到第二个峰值,这主要是由于极板间电场强度与空间电荷效应共同作用的结果。该研究可为提升微通道板光电倍增管的动态范围提供指导,便于其应用于强辐射脉冲测量、激光通信等领域。</p>
2024-03-21T08:46:31Z
海洋湍流下双拉盖尔-高斯涡旋光束的闪烁指数与误码率研究
刁鲁欣
王明军
黄朝军
吴小虎
汪伟
http://www.irgrid.ac.cn:8080/handle/1471x/7275986
2024-03-26T16:09:09Z
2024-03-21T07:25:40Z
题名: 海洋湍流下双拉盖尔-高斯涡旋光束的闪烁指数与误码率研究
作者: 刁鲁欣; 王明军; 黄朝军; 吴小虎; 汪伟
摘要: <p>采用功率谱反演法模拟了同轴叠加产生的双拉盖尔-高斯涡旋光束(Double Laguerre-Gaussian Vortex Beam,DLGVB)在海洋湍流中传输时的光强和相位分布,仿真分析了DLGVB光束在不同海洋湍流参数下的闪烁指数以及在基于开关键控调制的水下光通信系统中的通信误码率。结果表明,随着湍流动能耗散率的减小,盐度温度波动平衡参数、温度方差耗散率及传输距离的增加,闪烁指数逐渐增加;随着湍流动能耗散率以及拓扑电荷差值的增加,误码率减小。在海洋湍流环境下,使用DLGVB光束进行传输可以抑制海洋湍流带来的干扰,选择最佳的拓扑电荷差值,可以有效提高传输通信质量及通信系统容量。本文研究结果对涡旋光束及其叠加态在海洋湍流下传输特性研究及水下光通信系统持续扩容的发展需求方面具有重要的参考价值。</p>
2024-03-21T07:25:40Z
基于BLOB区域和边缘特征分析的准直图像双光学目标识别方法
何文轩
王拯洲
魏际同
王力
弋东驰
http://www.irgrid.ac.cn:8080/handle/1471x/7275980
2024-03-26T16:09:09Z
2024-03-21T07:13:07Z
题名: 基于BLOB区域和边缘特征分析的准直图像双光学目标识别方法
作者: 何文轩; 王拯洲; 魏际同; 王力; 弋东驰
摘要: <p>针对光路对接准直目标识别算法对双目标粘连状态无法判别的问题,提出了基于二进制大对象(Binary Large Object,BLOB)区域和边缘特征分析的准直图像双光学目标识别方法。首先,对二值化图像进行数字形态学处理,计算全图各BLOB区域的面积、中心、轴长、区域、有效BLOB区域个数等信息。其次,对有效BLOB区域个数大于1的完全分离双目标准直图像,统计各BLOB区域中心分别为位于两个面积最大的BLOB区域内的BLOB数量,数量小的候选BLOB区域为主激光目标,数量大的候选BLOB区域为模拟光目标。然后,对于有效BLOB区域个数等于1的待识别图像,从左、右、上、下4个方向分别提取模板边缘图像的有效坐标序列和待识别边缘图像坐标序列,搜索有效坐标序列和待识别边缘图像坐标序列的最大相关系数对应的有效坐标序列。当4个方向的相关系数全部大于0.95时,待识别图像为模拟光目标;当4个方向的相关系数都小于0.95时,待识别图像为主激光目标;否则待识别图像为粘连图像。实验结果表明:提出的双光学目标识别算法,不仅能够识别完全分离的模拟光目标和主激光目标,误差小于3个像素,处理时间小于1 s,而且能够判别处于粘连状态的光学目标和单个独立的光学目标,满足光路对接准直图像识别算法对于自适应性、精度和效率的要求。</p>
2024-03-21T07:13:07Z